package com.hxxdemo.weixinsaomalogin.util;

import java.io.InputStream;
import java.io.Writer;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.servlet.http.HttpServletRequest;

import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.core.util.QuickWriter;
import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
import com.thoughtworks.xstream.io.xml.PrettyPrintWriter;
import com.thoughtworks.xstream.io.xml.XppDriver;

/**
 * 消息工具类
 *
 * @author lvhuina
 * @date 2016-01-15
 */
public class MessageUtil {

    /**
     * 返回消息类型：文本
     */
    public static final String RESP_MESSAGE_TYPE_TEXT = "text";

    /**
     * 返回消息类型：音乐
     */
    public static final String RESP_MESSAGE_TYPE_MUSIC = "music";

    /**
     * 返回消息类型：图文
     */
    public static final String RESP_MESSAGE_TYPE_NEWS = "news";

    /**
     * 请求消息类型：文本
     */
    public static final String REQ_MESSAGE_TYPE_TEXT = "text";

    /**
     * 请求消息类型：图片
     */
    public static final String REQ_MESSAGE_TYPE_IMAGE = "image";

    /**
     * 请求消息类型：链接
     */
    public static final String REQ_MESSAGE_TYPE_LINK = "link";

    /**
     * 请求消息类型：地理位置
     */
    public static final String REQ_MESSAGE_TYPE_LOCATION = "location";

    /**
     * 请求消息类型：音频
     */
    public static final String REQ_MESSAGE_TYPE_VOICE = "voice";

    /**
     * 请求消息类型：推送
     */
    public static final String REQ_MESSAGE_TYPE_EVENT = "event";

    /**
     * 事件类型：subscribe(订阅)
     */
    public static final String EVENT_TYPE_SUBSCRIBE = "subscribe";

    /**
     * 事件类型：unsubscribe(取消订阅)
     */
    public static final String EVENT_TYPE_UNSUBSCRIBE = "unsubscribe";

    /**
     * 事件类型：CLICK(自定义菜单点击事件)
     */
    public static final String EVENT_TYPE_CLICK = "CLICK";

    /**
     * 解析微信发来的请求（XML）
     *
     * @param request
     * @return
     * @throws Exception
     */
    @SuppressWarnings("unchecked")
    public static Map<String, String> parseXml(HttpServletRequest request) throws Exception {
        // 将解析结果存储在HashMap中
        Map<String, String> map = new HashMap<String, String>();

        // 从request中取得输入流
        InputStream inputStream = request.getInputStream();
        // 读取输入流
        SAXReader reader = new SAXReader();
        Document document = reader.read(inputStream);
        // 得到xml根元素
        Element root = document.getRootElement();
        // 得到根元素的所有子节点
        List<Element> elementList = root.elements();

        // 遍历所有子节点
        for (Element e : elementList)
            map.put(e.getName(), e.getText());

        // 释放资源
        inputStream.close();
        inputStream = null;

        return map;
    }


    /**
     * 扩展xstream，使其支持CDATA块
     *
     * @date 2016-01-15
     */
    private static XStream xstream = new XStream(new XppDriver() {
        public HierarchicalStreamWriter createWriter(Writer out) {
            return new PrettyPrintWriter(out) {
                // 对所有xml节点的转换都增加CDATA标记
                boolean cdata = true;

                @SuppressWarnings("unchecked")
                public void startNode(String name, Class clazz) {
                    super.startNode(name, clazz);
                }

                protected void writeText(QuickWriter writer, String text) {
                    if (cdata) {
                        writer.write("<![CDATA[");
                        writer.write(text);
                        writer.write("]]>");
                    } else {
                        writer.write(text);
                    }
                }
            };
        }
    });


    /**
     * 从html中抽取出历史上的今天信息
     *
     * @param html
     * @return
     */
    public static String extract(String html) {
        StringBuffer buffer = null;
        // 日期标签：区分是昨天还是今天  
        String dateTag = getMonthDay(0);

        Pattern p = Pattern.compile("(.*)(<div class=\"listren\">)(.*?)(</div>)(.*)");
        Matcher m = p.matcher(html);
        if (m.matches()) {
            buffer = new StringBuffer();
            if (m.group(3).contains(getMonthDay(-1)))
                dateTag = getMonthDay(-1);

            // 拼装标题  
            buffer.append("≡≡").append(" 历史上的  ").append(dateTag).append("≡≡").append("\n\n");

            // 抽取需要的数据  
            for (String info : m.group(3).split("  ")) {
                info = info.replace(dateTag, "").replace("（图）", "").replaceAll("</?[^>]+>", "").replace("&nbsp;", "").trim();
                // 在每行末尾追加2个换行符  
                if (!"".equals(info)) {
                    buffer.append(info).append("\n\n");
                }
            }
        }
        // 将buffer最后两个换行符移除并返回  
        return (null == buffer) ? null : buffer.substring(0, buffer.lastIndexOf("\n\n"));
    }

    /**
     * 获取前/后n天日期(M月d日)
     *
     * @return
     */
    public static String getMonthDay(int diff) {
        DateFormat df = new SimpleDateFormat("M月d日");
        Calendar c = Calendar.getInstance();
        c.add(Calendar.DAY_OF_YEAR, diff);
        return df.format(c.getTime());
    }


    /**
     * 获取城市天气预报代码
     *
     * @param args
     */

    public static String getWeather(String cityName) {


        return "w";
    }

}
